Question

Ratio And Proportion

Answer 1

1)
Data:

$\frac{boys}{girls} = \frac{2}{5}$
Total pupils = 140

Solving:

$140* \frac{2}{5} = \frac{280}{5} = 56boys$
$140 - 56 = 84girls$


2)

Data:

$\frac{boys}{girls} = \frac{5}{4}$
Total boys =120

$g* \frac{5}{4} = 120$
$\frac{5g}{4} = 120$
$5g = 120*4$
$5g = 480$
$g = \frac{480}{5}$
g = 96

Answer: 96 girls